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repmgrd: handle situations where streaming replication is inactive

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This commit is contained in:
Ian Barwick
2016-05-12 21:48:17 +09:00
committed by Ian Barwick
parent 52281fcde8
commit cf126642bd
1 changed files with 27 additions and 4 deletions
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31
repmgrd.c
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@@ -718,6 +718,7 @@ standby_monitor(void)
int active_master_id;
const char *upstream_node_type = NULL;
bool receiving_streamed_wal = true;
/*
* Verify that the local node is still available - if not there's
* no point in doing much else anyway
@@ -1002,10 +1003,24 @@ standby_monitor(void)
strncpy(last_xlog_receive_location, PQgetvalue(res, 0, 1), MAXLEN);
strncpy(last_xlog_replay_location, PQgetvalue(res, 0, 2), MAXLEN);
strncpy(last_xact_replay_timestamp, PQgetvalue(res, 0, 3), MAXLEN);
last_xlog_receive_location_gte_replayed = (strcmp(PQgetvalue(res, 0, 4), "t") == 0)
? true
: false;
/*
* If pg_last_xlog_receive_location is NULL, this means we're in archive
* recovery and will need to calculate lag based on pg_last_xlog_replay_location
*/
/*
* Replayed WAL is greater than received streamed WAL
*/
if (PQgetisnull(res, 0, 1))
{
receiving_streamed_wal = false;
}
PQclear(res);
/*
@@ -1017,11 +1032,10 @@ standby_monitor(void)
* PostgreSQL log. In the absence of a better strategy, skip attempting
* to insert a monitoring record.
*/
if (last_xlog_receive_location_gte_replayed == false)
if (receiving_streamed_wal == true && last_xlog_receive_location_gte_replayed == false)
{
log_verbose(LOG_WARNING,
"Invalid replication_lag value calculated - is this standby connected to its upstream?\n");
return;
"Replayed WAL newer than received WAL - is this standby connected to its upstream?\n");
}
/* Get master xlog info */
@@ -1040,9 +1054,18 @@ standby_monitor(void)
/* Calculate the lag */
lsn_master_current_xlog_location = lsn_to_xlogrecptr(last_wal_master_location, NULL);
lsn_last_xlog_receive_location = lsn_to_xlogrecptr(last_xlog_receive_location, NULL);
lsn_last_xlog_replay_location = lsn_to_xlogrecptr(last_xlog_replay_location, NULL);
if (last_xlog_receive_location_gte_replayed == false)
{
lsn_last_xlog_receive_location = lsn_last_xlog_replay_location;
}
else
{
lsn_last_xlog_receive_location = lsn_to_xlogrecptr(last_xlog_receive_location, NULL);
}
/*
* Build the SQL to execute on master
*/